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US6274977B1 - Cathode ray tube with specifically shaped panel - Google Patents

Cathode ray tube with specifically shaped panel Download PDF

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Publication number
US6274977B1
US6274977B1 US09/398,890 US39889099A US6274977B1 US 6274977 B1 US6274977 B1 US 6274977B1 US 39889099 A US39889099 A US 39889099A US 6274977 B1 US6274977 B1 US 6274977B1
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US
United States
Prior art keywords
thickness
panel
horizontal
vertical
mathematical formula
Prior art date
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Expired - Fee Related
Application number
US09/398,890
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English (en)
Inventor
Do-houn Pyun
Wan Kim
Chan-Yong Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung SDI Co Ltd
Original Assignee
Samsung Display Devices Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Display Devices Co Ltd filed Critical Samsung Display Devices Co Ltd
Assigned to SAMSUNG DISPLAY DEVICES CO., LTD. reassignment SAMSUNG DISPLAY DEVICES CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, CHAN-YONG, KIM, WAN, PYUN, DO-HOUN
Application granted granted Critical
Publication of US6274977B1 publication Critical patent/US6274977B1/en
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Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/15—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen with ray or beam selectively directed to luminescent anode segments
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/861—Vessels or containers characterised by the form or the structure thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/86—Vessels and containers
    • H01J2229/8613—Faceplates
    • H01J2229/8616—Faceplates characterised by shape
    • H01J2229/862—Parameterised shape, e.g. expression, relationship or equation

Definitions

  • the present invention relates to a cathode ray tube (CRT) and, more particularly, to a flat-panel CRT which can minimize raster distortion of electron beams while maintaining structural strength of a shadow mask.
  • CTR cathode ray tube
  • a faceplate panel for CRTs is shaped like a convex lens. Both sides of the faceplate panel, an inner phosphor-coated side and an outer viewing screen side, have a curved shape. This is because the convex-shaped panel has advantages in various aspects such as convenience of formation, stability in strength, and adaptability for shadow mask application.
  • the screen image should be displayed as substantially flat. For this reason, several attempts have been made to form both sides of the faceplate panel with a flat shape while maintaining the normal display characteristics of the CRT. It is found that when a flat panel is used for the display screen problems occur in the convergence characteristics of electron beams and in the strength of a shadow mask. For example, when the surface of the phosphor-coated side is flat-shaped, it becomes difficult to deflect three electron beams of red R, green G and blue B correctly on a suitable convergence point. Furthermore, because the shadow mask facing the inner side of the panel should be correspondingly flat-shaped, the desired strength of the shadow mask cannot be achieved through the common shadow mask forming technique.
  • the outer viewing screen side is formed with a flat shape and the inner phosphor-coated side with a curved shape.
  • the formation characteristics of the panel can be improved and the corresponding shadow mask can be formed with a stable structure capable of reducing a doming phenomenon.
  • the peripheral portion of the panel is undesirably thick and this results in poor production efficiency as well as high production cost.
  • the large thickness of the peripheral portion has a poor transmission rate and ultimately causes brightness failure.
  • a CRT provided with a panel having an inner phosphor-coated side with a curved shape, an outer viewing screen side with a substantially flat shape, and a rectangular-shaped effective screen area ranged through the inner phosphor-coated side and the outer viewing screen side.
  • a shadow mask faces the phosphor-coated side of the panel.
  • the shadow mask is formed to be adapted to the curved shape of the phosphor-coated side.
  • the panel is sealed to a funnel which is in turn connected to a neck having an electron gun therein.
  • the rectangular-shaped effective screen area of the panel has two horizontally parallel long sides meeting a vertical axis V 1 , two vertically parallel short sides extended perpendicular to the horizontal sides, and four boundary corners formed between the neighboring horizontal and vertical sides.
  • the vertical sides meet a horizontal axis H 1 and each of the boundary corners meet a diagonal axis D 1 .
  • the meeting point of the horizontal long side and the vertical axis V 1 has a thickness Tv.
  • the meeting point of the vertical short side and the horizontal axis H1 has a thickness Th.
  • the meeting point of the boundary corner and the diagonal axis D 1 has a thickness Td.
  • the thickness ratio of Tv to Td is in the range of 0.75 ⁇ Tv/Td ⁇ 0.93, whereas the thickness ratio of Th to Td is in the range of 0.75 ⁇ Th/Td ⁇ 0.85.
  • FIG. 1 is a fragmentary sectional perspective view of a CRT according to a preferred embodiment of the present invention
  • FIG. 2 is a front view of a panel shown in FIG. 1;
  • FIG. 3 is a sectional view of the panel shown in FIG. 2 cut along a vertical axis line;
  • FIG. 4 is a sectional view of the panel shown in FIG. 2 cut along a horizontal axis line;
  • FIG. 5 is a sectional view of the panel shown in FIG. 2 cut along a diagonal axis line.
  • FIG. 1 is a cut-away view of a CRT in accordance with the present invention.
  • the CRT includes a neck 4 having an electron gun 2 therein, a funnel 6 integrally connected to the neck and a panel 8 sealed to the funnel.
  • the inner surface of the panel, coated with phosphors, has a curvature and the outer surface is substantially flat.
  • a shadow mask 10 is disposed spaced apart and facing the inner surface of the panel.
  • the shadow mask is curved to substantially correspond to the curved inner surface of the panel.
  • the panel 8 has a rectangular effective screen area, a portion of the panel at which an image is actually formed is defined by two relatively long parallel sides 12 , and two relatively short parallel sides 14 .
  • the vertical axis V 1 , horizontal axis H 1 and diagonal axis D 1 all pass through and intersect at the center 16 of the screen.
  • the thickness of the panel at a point where the vertical axis V 1 crosses either of the long sides 12 is defined to be Tv.
  • the thickness of the panel at a point where the horizontal axis H 1 crosses either of the short sides 14 is defined as Th.
  • the thickness of the panel at a point where the diagonal axis D 1 meets the boundary of the effective screen area is defined as Td. As illustrated in FIGS. 3-5 each of the thicknesses Tv, Th and Td is greatest in the cross sections cut along V 1 , H 1 and D 1 respectively.
  • a primary novel feature of the present invention lies in the relation among the three thicknesses as follows.
  • the thickness ratios Tv/Td and Th/Td are less than 0.75 and 0.76 respectively, a shadow mask that is supposed to have a similar curvature, can not maintain adequate structural strength because its overall curvature is too small.
  • the thickness ratios Tv/Td and Th/Td are greater than 0.93 and 0.85 respectively, deflected electron beams suffer raster distortions and light transmission in the periphery of the panel becomes poor.
  • Tc thickness of the panel at its center 16
  • Td thickness of the panel at its center 16
  • the inner surface of the panel has curvature radii Rh at the horizontal axis H 1 , Rv at the Vertical axis V 1 and Rd at the diagonal axis D 1 , which are related as follows.
  • the inventive CRT is provided with a panel which has optimum peripheral thickness ratios as well as optimum curvature radii, contributing to reduced raster distortion and, at the same time, allowing a corresponding shadow mask with good structural strength.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US09/398,890 1999-01-20 1999-09-20 Cathode ray tube with specifically shaped panel Expired - Fee Related US6274977B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1019990001593A KR100277797B1 (ko) 1999-01-20 1999-01-20 음극선관
KR99-1593 1999-01-20

Publications (1)

Publication Number Publication Date
US6274977B1 true US6274977B1 (en) 2001-08-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US09/398,890 Expired - Fee Related US6274977B1 (en) 1999-01-20 1999-09-20 Cathode ray tube with specifically shaped panel

Country Status (3)

Country Link
US (1) US6274977B1 (zh)
KR (1) KR100277797B1 (zh)
CN (1) CN1155047C (zh)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6593685B2 (en) * 2000-01-06 2003-07-15 Lg Electronics Inc. Color cathode ray tube
US20030137233A1 (en) * 2002-01-21 2003-07-24 Samsung Sdi Co., Ltd. Monochrome cathode ray tube and manufacturing method thereof
US6628062B1 (en) * 1999-04-16 2003-09-30 Lg Electronics, Inc. CRT panel having specified inner surface arc curvatures
US20040000860A1 (en) * 2002-06-26 2004-01-01 Jung Sung Han Cathode ray tube
EP1321960A3 (en) * 2001-12-19 2004-07-14 LG Philips Displays Korea Co., Ltd. Flat type color cathode ray tube
US20040239232A1 (en) * 2003-05-30 2004-12-02 Jae-Seung Baek Color cathode - ray tube
US20040245909A1 (en) * 2003-06-04 2004-12-09 Kim Gyung Rae Cathode ray tube
US20040263051A1 (en) * 2003-06-24 2004-12-30 Kim Gyung Rae Cathode ray tube
US20070018556A1 (en) * 2005-07-20 2007-01-25 Matsushita Toshiba Picture Display Co., Ltd. Color picture tube

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6597097B2 (en) * 2000-09-26 2003-07-22 Lg Electronics Inc. Cathode ray tube having panel with improved tensile stress
US7154215B2 (en) * 2003-09-05 2006-12-26 Lg. Philips Displays Korea Co., Ltd. Color cathode ray tube capable of reducing stress
US7291964B2 (en) * 2003-09-05 2007-11-06 Lg. Philips Displays Korea Co., Ltd. Color cathode ray tube
KR20050091399A (ko) * 2004-03-12 2005-09-15 엘지.필립스 디스플레이 주식회사 칼라 음극선관
CN101430995B (zh) * 2008-12-09 2010-06-09 彩虹显示器件股份有限公司 一种薄型化阴极射线管玻屏的设计方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0636710A (ja) 1992-07-21 1994-02-10 Hitachi Ltd 表示制御回路及び装置
JPH0644926A (ja) 1992-07-21 1994-02-18 Sony Corp 陰極線管ディスプレイ
US6157124A (en) * 1997-10-31 2000-12-05 Matsushita Electronics Corporation Cathode ray tube with specifically shaped inside picture area

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0636710A (ja) 1992-07-21 1994-02-10 Hitachi Ltd 表示制御回路及び装置
JPH0644926A (ja) 1992-07-21 1994-02-18 Sony Corp 陰極線管ディスプレイ
US6157124A (en) * 1997-10-31 2000-12-05 Matsushita Electronics Corporation Cathode ray tube with specifically shaped inside picture area

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6628062B1 (en) * 1999-04-16 2003-09-30 Lg Electronics, Inc. CRT panel having specified inner surface arc curvatures
US6593685B2 (en) * 2000-01-06 2003-07-15 Lg Electronics Inc. Color cathode ray tube
EP1321960A3 (en) * 2001-12-19 2004-07-14 LG Philips Displays Korea Co., Ltd. Flat type color cathode ray tube
US20030137233A1 (en) * 2002-01-21 2003-07-24 Samsung Sdi Co., Ltd. Monochrome cathode ray tube and manufacturing method thereof
US20040000860A1 (en) * 2002-06-26 2004-01-01 Jung Sung Han Cathode ray tube
US7061172B2 (en) * 2002-06-26 2006-06-13 Lg.Philips Displays Korea Co., Ltd. Cathode ray tube having improved structure of a flat panel
US20040239232A1 (en) * 2003-05-30 2004-12-02 Jae-Seung Baek Color cathode - ray tube
US7095165B2 (en) * 2003-05-30 2006-08-22 Lg.Philips Display Korea Co., Ltd. Color cathode ray tube
US20040245909A1 (en) * 2003-06-04 2004-12-09 Kim Gyung Rae Cathode ray tube
US20040263051A1 (en) * 2003-06-24 2004-12-30 Kim Gyung Rae Cathode ray tube
US20070018556A1 (en) * 2005-07-20 2007-01-25 Matsushita Toshiba Picture Display Co., Ltd. Color picture tube

Also Published As

Publication number Publication date
CN1155047C (zh) 2004-06-23
CN1261722A (zh) 2000-08-02
KR20000051256A (ko) 2000-08-16
KR100277797B1 (ko) 2000-12-15

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Owner name: SAMSUNG DISPLAY DEVICES CO., LTD., KOREA, REPUBLIC

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Effective date: 20130814